on Jasmine, one of Phoebe's coworkers, and mistakes her massage parlor for a whorehouse. He eventually falls in love with and becomes engaged to Alice Knight (Debra Jo Rupp), his former home-economics teacher who is 26 years his senior. In "The One With Phoebe's Uterus", Frank and Alice ask Phoebe to be a surrogate mother for their child, and she later gives birth to their triplets, whom she then says goodbye to in an emotional scene in "The One Hundredth". Frank makes a final appearance in "The One Where Ross is Fine", when he and the triplets meet Phoebe at Central Perk. In the episode, he claims he "hasn't slept in four years" and is so exhausted with raising the triplets he even proposed that Phoebe take one for her own. However, he soon realizes he loves his children too much to give any of them up; Phoebe proposes to start babysitting them so that Frank and Alice can enjoy some more time off. Previously, Ribisi appeared in "The One with the Baby on the Bus" as a stranger who leaves a condom rather than money in Phoebe's guitar case when she is singing on the street, then comes back to retrieve it. It was never addressed if this was intended to be the same character as Frank, who had not yet been introduced by name. In 2004, The Seattle Times ranked Frank as the fourth-best guest character of the series. Alice was only scheduled to appear in the one episode but was brought back for a recurring role after the surrogacy storyline—which was created when actor Lisa Kudrow became pregnant. Leonard Green Dr. Leonard Green (Ron Leibman): Rachel, Jill and Amy's father, a surly, abrasive and rather amoral vascular surgeon; although he is genuinely affectionate and usually good-natured towards his daughter, he is generally a mean-spirited, nasty and disrespectful bully who is quick to insult anyone who, even by accident, irritates him in the slightest way, even if an insult was not intended. He takes an instant dislike to his daughter's boyfriend Ross when the latter refers to Green's profession as "a game". Later, when Ross and Rachel conceive a child (Emma), he becomes furious that they're not engaged because he does not want his grandchild to be a bastard and ends up going to Ross' apartment and shouting at him because Rachel (who is afraid of Leonard's anger)